The dress is fabulous - I want to own it. I got so many compliments. I rented one size larger based on reviews. It is a bit snug in the hips (I am size 4 but with an ample rear) but the 4 (40) might have been fine, just more fitted. The back of this dress is amazing. It just looks very simple, then WOW. It is very low though - more so than in the photo when you move, so no room for spanx. I had to wear a very low thong. The color is much prettier in person - more red than orange.